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HI Doef, Thanks for all of this information. Unfortunately This is a 1990 YJ with a 2.5L with a single fuel injector mounted in the throttle body. This YJ only has 118,000 miles on it. Being 33 years old I immediately did a major tune up on the engine and replaced all sensors, ignition system...

1990 YJ 2.5l, my manual says starting input voltage is 5 volts. Mine is 5.13 volts. Out put is suppose to be 4.7 volts. Is 5.23 volts ok. I have changed 3 sensors and still have hesitation at different RPMs with each different sensor?

I have rebuilt my TB. Fuel pressure is now 15.5 PSI @ 2000 RPM. It’s 1 lb more than spec. Is this going to be a problem? I hate the thought of removing the the TB again to get at the adjusting screw on the regulator

Well that makes me feel better, that someone else ran in to this . I thought the cam as there are two Dowl pin holes in the cam. If the other pin hole was to be used the timing marks would’ve lined up. I tried to change the the pin but couldn’t remove it.

Has any one found when changing the timing gear sprockets, that the cam sprocket dowel pin is in the wrong hole in the cam making the timing mark on the sprocket 180 off. There are two holes in the end of the cam. I think someone during engine assemble back in 1990 was setting up a head scratcher.

We'll I went to change out the battery and found the neg. post was loose? I hope this maybe the problem.

Good point, The battery is five years old.

What is the best way to adjust the fuel pressure regulator on a 2.5 TBI system?

Ok thanks , I'll give them a call

Once in every 20 starts, the engine will not start, it will turn over for a long time with no start. Leave it sit for awhile and it will start. I have checked all the grounds connections, all in good shape. I rebuilt this jeep 2 years aga. The only sensor that I have not replaced is the PCM and...

I have a 1990 YJ with 2.5 and TBI. IT has been rebuilt 2 years ago and has been my daily driver. Lately it has developed hard to start. I have changed fuel pump. fuel pump relays, fuel filter is new. coil and ignition module. and all engine sensors at rebuild. I have checked all grounds and...